Insulating material.



J. H. WHITE.

INSULATING MATERIAL.

AIIILIOATION FILED JUNE 30, 1911.

Patented June 18; 1912.

Z0 if ass es JOHN HENRY WHITE, F PITTSBURGH, PENNSYLVANIA.-

INSULATING MATERIAL.

Specification of Letters Patent.

Patented June 18, 1912.

Application filed June 30, 1911. Serial No. 636,284,

ing,-such as a lining for refrigerator cars,

etc.

The object of my invention is to provide a cheap and efficient flexible insulating material, which is formed from a suitable fibrous material having a facing of water-' proof material on the sides of the same, and

one in which such facing will completely cover and be secured to such fibrous material or body, as well as enabling the article when formed to be capable of easy bending for use around or against surfaces or for being rolled up for shipment or handling.

To these ends my invention consists, generally stated, in the novel form andconstruction of an insulating material, as hereinafter more specifically setforth and described, and particularly pointed out in the claims. 1

To enable others skilled in the art to which my invention appertains to construct and use my improved insulating material, I will describe the same more fully, referring to the accompanying drawing, in which Figure 1 shows a perspective view of my improved insulating material in its flat form. Fig. 2 is 'a cross-section of the insulating material showing the same as formed around a mandrel for use on pipes. Fig. 3 is a like View showing the same in its finishe'd form around a. pipe. -Figs. 4 and 5 are like views of other forms of thematerial.

Like symbols of reference herein indicate like parts in each of the figures of the drawing.

As illustrated in the drawing, a represents my improved insulating "material having the main body 1, which is formed of hair felt, such as cattle hair felt, and. provided with the thick coating or facing 2 of flexible wate body, which is formed of a suitable hydrocarbon material, such as hydro-lene, comshown in FigZz-Q, so that while roof material on "each side of such posed of about ninety (90) parts of hydroother suitable materials.

The manner of forming my improved insulating material is as follows: A piece of the felt of the proper size and thickness for the main body 1 of the insulating material has .the hydro-carbon material andliquid form, such as hydro-lene, to form the waterproof facing on such felt, applied in any suitable manner directly to one of the slde surfaces or portions of such felt, and such material is s read evenly over such surface in any suita le manner, so that such material will be embedded, engaged or intermeshed in such surface and will be prevented from any further entrance into the body of such felt. After this is done the other side surface or portion ofthe felt body 1, is coated with the hydro-carbon material toform the other facing 2, in like manner and while these faces are in a heated state, pulverized steatite, silicate of magnesia, or other suitable material in powdered form is spread over such faces to close up the pores in such hydro-carbon material and thus form a smooth surface on said face,

which will form a film on said material, and thereby confine the paraflin gas formed by the heated coating to prevent-such coating from crystallizing, as well as" prevent the sticking together of twoof such coated surfaces, when placed together-or rolled" up for shipment. For the purpose of insulating pipes containing cold, refrigerant or other liquids, the felt so coated with hydrocarbon material on one of its side surfaces is cut to the required size and placed or en-. veloped over a mandrel 3 of the samesize as the pipe to be insulated, and with such in a heated y material can be composed of mineral rubber? and paraflin in the same proportions, or

coated surface against said mandrel to form the innercoated surface on the envelop, as so held upon such .mandrel this felt envelop 4 has the hydro-carbon material in a heated liquid form applied to the outer surface of such envelop in any suitable manner, which material will impregnate, engage, intermesh or embed itself into such outer surface, and

thus coat and form the outer Waterproof .2

. facing on said envelop while in a cylindrical form. This outer coating of the envelop 4 in forming will also enter the space or opening 4: formed between the side edges of the felt such envelop, and after this is done and while still on the mandrel 3, the envelop 4 is coiled and then rolled in the pulverized steatite, silicate of magnesia, or other suitable material in powdered form to close u and smooth such outer coating, as before escribed. This envelop 4 is aftenward slit open in any suitable manner adjacent the openin 4 and along the dotted line 4", such as by a knife ided by an opening or slit 3 in the man rel 3, so that said mandrel can then be'removed and-thecylindrical casing 4 so formed by said envelop is then ready for use.

When the casing 4 is applied to a pipe 5, as shown in Fig. 3, the space or opening between the side edges of the same as formed by the slitting at 4 can be filled with heated liquid hydro-carbon and if necessary closed up and smoothed down by the steatite or other suitable material, as before described,-

to complete the covering for such pipe,

.which covering can also be supplied'by suit-.

ableswire or other fastenings around the same or have other covering, such as paper or canvas placed around the same, and secured as described. I

It will be obvious that irregular curved and other shapes of flat felt sheets can be treated with the waterproofing material in like manner, and when in. flat form such material can be applied to both sides of the felt sheet in like manner, as that for one .side, as heretofore described, while where extreme temperatures are to be met with in the use of the insulating material and such temperatures are desired to be 'contained, the felt can .be subjected to-a double treatment of the waterproofing material in the manner described.

In Fig. 4 my improved insulating ma terial is shown as having its fibrous felt body .1 provided with the waterproof facing 2 on each side of the same, and with the outer facing when formed into the easing or covering. 4' for pipes provided'witha canvas or other textile coveringv 6 over the same, and through whichcovering 6 the material for the waterproof outer facing has passed in forming such facing when such material as the casing is held on the mandrel 3 is subjected tothe said material. When the casing 4 is afterward slit, as at 7, through one side and through a portion of the covering at the opposite side, as at 8, the canvas 6 on such side containing the waterproof material within the same can act as a hinge,

at 8,'for the two semi-circular sections. of

the casing in opening and closing the sections around 'a pipe, and in the dropping of the same along a pipe or in shipping when-closed.

In Fig. 5 the outer waterproof facin 2 on the casing 4 can be provided with a reproof covering over the same,-such as the asbestos sheet 9, and if desired, when the felt material a is used in certain cases for the covering of pipes, the waterproof inner facing thereon can be dispensed with in order to make such covering more flexible to bend around such pipes.

Various other modifications and changes in the manner of forming and construction of my improved insulating material may be resorted. to, without departing from the spirit of the invention or sacrificing any of its advantages.

It will thus be seen that my improved insulating material will provide felt having a facing thereon which will waterproof the same, as well as stop the progress of air 'through the material, so that the material will not only be waterproof, but air-tight and will in a high degree prevent the transmission of the energy contained in heat and cold. The adaptability and flexibility of my improved insulating material for withstanding the torsion strain of rolling stock onrailroads is of great value, especially in overcoming the present method of using waterproof paper on each side of the naked or plain hair felt to protect the same in lin-' ings for refrigerator cars, etc., which forms three units, such as two layers of paper and an intermediate layer of felt, while in the use of the present material, one unit is formed with a waterproof coating on each side of the same and impregnatedor intermeshed therein, so that the circulation of air is brought to a 'minimum by the coated felt as against felt and paper.

The body of the felt in my improved insulating material being thicker than the coating of waterproof material thereon will enable the fibers'ofthe felt to slip on each other in bending the material for any purpose and so permit the flexibility desired and the non-separation of the material. My improved insulating material-has the effect of self containing the dead air spaces contained in the fibrous felt employed, which would otherwise be channels of conduction, so that it thus increases the efficiency of such material to a greater measure, and the composition of the waterproof facing employed is not of a flammable nature like other bituminous by-products.

What I claim as my invention and desire to secure by Letters atentisj 1. An insulating material comprising a body portion of hair felt having a thick coating of flexible waterproof material intermeshed with the outer portions only of such felt, thereby leaving a thick flexible center in said insulating material. 2. An insulating material comprising a body portion of cattle hair felt having a thick coating of flexible waterproof material intermeshed with the outer portions only of such felt, thereby leaving a thick flexible center in said insulating material.

' 3. An insulating material comprising a body portion of hair felt having a thick coating of flexible hydro-carbon material intermeshed with the outer portions only of such felt toform a waterproof facing thereon, thereb'y'leaving a thick flexible center in said insulating material. 4. An insulating material comprising a body portion of cattle hair felt having a thick coating of flexible hydro-carbon material intermeshed with the outer portions only of such felt to form a waterproof facing thereon, thereby leaving a thick flexible center in said insulating material. 5. A pipe covering comprising a body portion of hair felt having a thick coating of flexible waterproof material intermeshed with the inner and outer portions only of such felt, thereby leaving a thick flexible center in said covering.

6. A pipe covering comprising a bod portion of cattle hair felt-having a thic coating of flexiblefiwaterproof material intermeshed with the inner and outer p'ortions only of such felt, thereby leaving a thick flexible center in said covering.

7. A pipe covering comprising a body portion of hair felt having athick coating of flexible hydro-carbon material intermeshed with the inner and outer portions-of such felt only to form a waterproof facing .thereon, thereby leaving a thick flexible center in said covering.

8. A pipe covering comprising a bod portion of cattle hair felt having a thick coating of flexible hydro-carbon material intermeshed with the inner and outer portions of such felt only to form a waterproof facing thereon, thereby leaving a thick flexible center in said covering.

9. A pipe covering comprising a body portion of hair felt having a thick coating of flexible waterproof material intermeshed with theinner and outer portions only of said felt, thereby leaving a thick flexible center in said covering, and said material being also between the side joining edges of such felt and intermeshed therewith.

10. A pipe covering comprising a body.

portionofcattle hair felt aving a thick coating of flexible waterproof material intermeshed with the inner and outer portions,

only of said felt, thereby leaving a thick flexible center in said covering, and said material being also between the side/joining edges of such felt and intermeshed therewith.

11. A pipe covering comprising a body only of portion of hair felt havinga thick coating of flexible hydro-carbon material intermeshed with the inner and outer portions said felt to form a waterproof facing thereon and thereby leaving a thick flexible center in said covering, said material bein also between the side joining edges of $110 felt and intermeshed therewith.

12. A pipe covering comprising a body portion of cattle hair felt having a thick coating of flexible hydro-carbon material intermeshed with the inner and outer portions only of said felt to form a waterproof facing thereon and thereby leaving a thick flexible center in said covering, said material being also between the side joining edges of such felt and intermeshed therewit 13. A pipe covering comprising a body portion of hair felt having a thick coating of flexible waterproof material intermeshed With the inner and outer portions only of said felt, thereby leaving a thick flexible center in said covering, a slit in said felt and said material being also between the side joining edges and the slit of such felt and intermeshed therewith.

.14. A pipe covering comprising a body portion of cattle hair felt having a thick coating of flexible waterproof material intermeshed with the inner and outer portions. only of said felt, thereby leaving a thick .flexible center in said covering, a slit in said felt and said material being also between the side joining edges and the slit of such felt and intermeshed therewith.

15. A pi e covering comprisin a body portion of air felt having a thic coating of flexible hydro-carbon material intermeshed with the inner and outer portions only of said felt to form a waterproof facing thereon and thereby leaving a thick flexible center in said covering, a slit in said felt and said material being also between the side joining edges'and theslit of such felt and intermeshed therewith.

16. A pipe covering comprising a body portion of cattle hair felt having a thick coatingof flexible hydro-carbon material intermeshed with the inner and outer portions only of said felt to form a waterproof facing thereon and thereby leaving a thick flexible center in said covering, a slit in said felt and said material being also between the side joining edges and the .slit of such felt and intermeshed therewith.

In testimony whereof, I, the said Joint HENRY WHITE, have hereunto set my hand.

' JOHN HENRY WHITE. Witnesses:

J. N. COOKE, T. B. HUMPHRIES. 

